How to Kill a Tremortusk - Horizon Forbidden West

The First thing you will need to do is clear the left path to have easier access to the ravager canon later in the fight.

After that, silently strike the first rebel.

Then use the bow to shoot down the second one, ideally aim on the parts of the body where there is no armor.

You don't have to one shot him but be quick regardless, you have to get a stealth kill.

You can then freely move towards the ballista.

After mounting the ballista, you must try to shoot down some of these parts, but generally you can hit him anywhere where he doesn't have any armor.

Next, you have to ready your bow and focus on destroying the blaze sac, you can use your hunting valor surge if you have any for extra damage.

After the blaze sac explodes, switch to a quicker bow and shoot as many arrows as you can while running towards him.

After that, run below his body and then shoot at him again from the back (when near him, you can use a smoke bomb).

Finally, when he turns back in your direction, you have to run to pick up the ravager cannon.

And destroy him, if there are some HP left, usually one or two more arrows finish the job.